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1 <br />' INTRODUCTION <br />The Colorado Yampa Coal Company Mine No. 3 is located approximately <br />25 miles southwest of Steamboat Springs, Colorado in Twentymile <br />Park (Figure 1). It was primarily a surface coal mining operation <br />with limited underground mining. The surface mine, which was <br />' activated between 1974 and 1980, was called Mine No. 3. It was <br />faced-up in a Mine No. 3 highwall. Operations began May 16, 1979, <br />but the mine was abandoned on June 5, 1980 due to adverse mining <br />conditions. No significant amounts of coal were extracted. The <br />' Wadge coal seam was extracted at both mines. There is no active <br />mining in this area and a total of approximately 350 acres were <br />disturbed. Mine 3 straddles the confluence of Middle and Foidel <br />Creeks. A small portion of Mine No. 3 drains into Fish Creek; <br />however, bond has been released for this area. All impacts related <br />to Fish creek are discussed in the 1991 Water Year Annual <br />' Hydrologic Report for the Foidel Creek Mine (Permit No. C-82-056). <br />Mine No. 3 area has been backfilled, regraded, and revegetated. An <br />administrative facility located in the Mine 3 area is still used by <br />Colorado Yampa Coal Company. County road 33 runs through the site. <br />' Hydrologic monitoring has been conducted in the area since 1975. <br />This report covers the hydrologic monitoring for the Water Year <br />1991. The previous monitoring of this area was presented in the <br />previous Annual Hydrologic Reports. The hydrologic monitoring has <br />been divided into four parts: 1) ground water, 2) surface <br />water, 3) spoil springs, and 4) effluent sites. The monitoring <br />' locations are shown on Figure 2 and summarized on Table 1. The <br />parameter lists are shown on Tables 2 and 3. A complete listing of <br />all water data collected at the monitoring sites is submitted <br />t separately. Summaries of the complete data set and the 1991 data <br />are presented on Tables 4 to 24 and Figures 4 to 21. <br />' Since mid-1987 most of the monitoring has been conducted by Cyprus <br />personnel. Most of the water quality analyses were performed by <br />ACZ Laboratories (formerly Bookcliffs) of Steamboat Springs, <br />Colorado. Prior to June, 1986 some of the water quality testing <br />was performed by the Colorado Yampa Coal Company laboratory. Two <br />sites are monitored for flow by the US Geologic Survey (USGS) . <br />Until the 1989 Water Year the USGS also collected and analyzed the <br />t water samples for the two sites. Beginning the 1989 Water Year <br />Cyprus collected the samples and ACZ laboratories analyzed the <br />samples. Unless otherwise indicated all references to "1991" in <br />this report to refer to Water Year 1991. <br /> <br />' - 1 - <br />1 <br />